CVE-2026-104969

Plane is an open-source project management tool. Prior to 1.4.0, the cycle-issues endpoint accepts issue UUIDs in the request body without validating that they belong to the caller's workspace. An authenticated user can add issues from any workspace to a cycle they control. If a victim issue is already assigned to a cycle, the operation removes it from the victim's cycle, causing a destructive cross-tenant write. This issue is fixed in 1.4.0.

• https://github.com/makeplane/plane/commit/81d9873d7f1cf1d1252ed53c12dd33696be73a89
• https://github.com/makeplane/plane/pull/9269
• https://github.com/makeplane/plane/releases/tag/v1.4.0
• https://github.com/makeplane/plane/security/advisories/GHSA-22g9-9xfv-q3fr
• https://github.com/makeplane/plane/security/advisories/GHSA-22g9-9xfv-q3fr